Remove Immutable JS

src/libs/style.js

@@ -1,68 +1,30 @@
 import React from 'react';
-import Immutable from 'immutable'
 import spec from 'mapbox-gl-style-spec/reference/latest.min.js'
 
-// Standard JSON to Immutable conversion except layers
-// are stored in an OrderedMap to make lookups id fast
-// It also ensures that every style has an id and
-// a created date for future reference
-function fromJSON(jsonStyle) {
-  if (typeof jsonStyle === 'string' || jsonStyle instanceof String) {
-    jsonStyle = JSON.parse(jsonStyle)
-  }
-
-  return Immutable.Map(Object.keys(jsonStyle).map(key => {
-    const val = jsonStyle[key]
-    if(key === "layers") {
-      return [key, Immutable.OrderedMap(val.map(l => [l.id, Immutable.fromJS(l)]))]
-    } else if(key === "sources" || key === "metadata" || key === "transition") {
-      return [key, Immutable.fromJS(val)]
-    } else {
-      return [key, val]
-    }
-  }))
-}
-
 // Empty style is always used if no style could be restored or fetched
-const emptyStyle = ensureMetadataExists(fromJSON({
+const emptyStyle = ensureMetadataExists({
   version: 8,
   sources: {},
   layers: [],
-}))
+})
 
 function ensureHasId(style) {
-  if(style.has('id')) return style
-  return style.set('id', Math.random().toString(36).substr(2, 9))
+  if('id' in style) return style
+  style.id = Math.random().toString(36).substr(2, 9)
+  return style
 }
 
 function ensureHasTimestamp(style) {
-  if(style.has('id')) return style
-  return style.set('created', new Date().toJSON())
+  if('created' in style) return style
+  style.created = new Date().toJSON()
+  return style
 }
 
 function ensureMetadataExists(style) {
   return ensureHasId(ensureHasTimestamp(style))
 }
 
-// Turns immutable style back into JSON with the original order of the
-// layers preserved
-function toJSON(mapStyle) {
-  const jsonStyle = {}
-  for(let [key, value] of mapStyle.entries()) {
-    if(key === "layers") {
-      jsonStyle[key] = value.toIndexedSeq().toJS()
-    } else if(key === 'sources' || key === "metadata" || key === "transition") {
-      jsonStyle[key] = value.toJS()
-    } else {
-      jsonStyle[key] = value
-    }
-  }
-  return jsonStyle
-}
-
 export default {
-  toJSON,
-  fromJSON,
   ensureMetadataExists,
   emptyStyle,
 }